JP7697361B2 - Vehicle outer panel and vehicle hood - Google Patents

Description

The present invention relates to a vehicle exterior panel and a vehicle hood, and in particular to a vehicle exterior panel and a vehicle hood that use a resin-coated steel plate.

Patent Document 1 discloses doors, bonnets, and engine hoods as examples of automobile parts that use resin-coated steel sheets. These are also specific examples in which vehicle exterior panels are used.

JP 2000-070842 A

The present inventors have discovered the following problems.
In many cases, a vehicle exterior panel includes a steel plate and a reinforcing member. The steel plate has a shape of a vehicle exterior panel. The reinforcing member reinforces the steel plate. The reinforcing member is provided on the vehicle inner side of the steel plate. The reinforcing member and the steel plate are often bonded to each other via a mastic adhesive. There is no paint on the interface between the vehicle inner surface of the steel plate and the reinforcing member, which has been a weak point in terms of rust prevention.

In view of the above-mentioned problems, the present invention aims to provide a vehicle exterior panel and a vehicle hood that have improved rust resistance at the interface between the vehicle's inner surface and the reinforcing member.

A vehicle exterior panel according to one aspect of the present invention includes:
A vehicle exterior panel for covering the interior of a vehicle,
A steel plate having a shape of a vehicle outer panel;
A reinforcing member provided on an inner surface of the steel plate to reinforce the steel plate;
A first resin layer that covers the vehicle inner surface of the steel plate,
The reinforcing member is not covered with a resin layer.

With this configuration, the first resin layer covers the vehicle inner surface of the steel plate, improving rust prevention at the interface between the vehicle inner surface and the reinforcing member.

Another feature of the structure is that a mastic adhesive is provided between the steel plate and the reinforcing member.

With this configuration, the first resin layer covers the vehicle inner surface of the steel plate, improving the rust prevention between the mastic adhesive and the steel plate. In addition, since the steel plate and the reinforcing member are joined using the mastic adhesive, there is no need to use heat welding. This avoids the effect of heat welding on the design of the vehicle exterior panel, and suppresses any deterioration in the design of the vehicle exterior panel.

The outer surface of the steel plate may also be characterized in that it is not covered with a resin layer.

With this configuration, the outer surface of the steel plate is not covered with a resin layer. This allows the amount of resin layer used to be reduced while still ensuring rust prevention between the reinforcing member and the steel plate, which reduces costs.

Also, a second resin layer covering the outer surface of the steel plate,
The first resin layer may be thicker than the second resin layer.

With this configuration, the first resin layer covers the vehicle inner surface of the steel plate, and the second resin layer covers the outer surface of the steel plate. Therefore, rust prevention can be ensured for the outer surface of the steel plate in addition to between the reinforcing member and the steel plate. In addition, since the second resin layer is thinner than the first resin layer, the amount of resin layer used can be reduced. This allows costs to be reduced.

A vehicle hood according to one aspect of the present invention is an application of the vehicle outer panel described above.

This configuration improves rust resistance at the interface between the engine room side surface of the vehicle hood and the reinforcing member.

The present invention can provide a vehicle exterior panel and a vehicle hood that have improved rust resistance at the interface between the vehicle's inner surface and the reinforcing member.

1 is a schematic diagram showing an example of a vehicle inner surface of an outer panel for a vehicle according to a first embodiment. FIG. 1 is a schematic cross-sectional view of a main portion of an example of a vehicle exterior panel according to a first embodiment. 4 is a schematic cross-sectional view of a main portion of a modified example of a vehicle outer panel according to the first embodiment. FIG.

Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, the following descriptions and drawings have been simplified as appropriate for clarity of explanation.

(Embodiment 1)
A first embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a schematic diagram showing a vehicle inner surface of an example of a vehicle outer panel according to the first embodiment. Fig. 2 is a schematic cross-sectional view of a main part of the example of the vehicle outer panel shown in Fig. 1.

Naturally, the right-handed XYZ coordinate system shown in FIG. 1 and other drawings is for the convenience of explaining the positional relationships of the components. Normally, the positive Z axis is vertically upward, and the XY plane is a horizontal plane, which is common between the drawings. Also, the positive Z axis is the outside of the vehicle, and the negative Z axis is the inside of the vehicle.

As shown in FIG. 1, the vehicle exterior panel 10 includes a resin-coated steel plate 1 and a reinforcing member 2. The vehicle exterior panel 10 may be any panel that covers the interior of a vehicle. The vehicle exterior panel 10 may be applied to, for example, a vehicle hood, roof, or door. When the vehicle exterior panel 10 is applied to a vehicle hood, it covers the engine compartment inside the vehicle. When the vehicle exterior panel 10 is applied to a roof or door, it covers the passenger compartment inside the vehicle.

The resin-coated steel sheet 1 shown in FIG. 1 is an example of a substantially rectangular plate, but the resin-coated steel sheet 1 may also have, for example, a vehicle hood shape, a roof shape, or a door shape.

As shown in FIG. 2, the resin-coated steel sheet 1 comprises a steel sheet 1a and a first resin layer 1b.

The steel sheet 1a has a shape of an outer panel for a vehicle. The steel sheet 1a has mechanical properties required for an outer panel for a vehicle. The steel sheet 1a may have an appropriate thickness so that the resin-coated steel sheet 1 can secure the rigidity required for an outer panel for a vehicle. In addition, if the steel sheet 1a has an appropriate thickness and the resin-coated steel sheet 1 secures the rigidity required for an outer panel for a vehicle, it is not necessary to use the mastic adhesive 3 described later. Specifically, the steel sheet 1a may be made of ordinary steel or steel containing an additive element such as chromium. In addition, a plating film may be provided on the surface of the steel sheet 1a. The type of the plating film on the surface of the steel sheet 1a is not particularly limited. Applicable plating films include, for example, plating containing any one of zinc, aluminum, cobalt, tin, and nickel, and alloy plating containing these metal elements and further other metal elements and nonmetal elements. In addition, both sides, only one side, a part of the surface, or the entire surface of the metal sheet may be covered with a coating film depending on the application.

The first resin layer 1b covers the vehicle inner surface of the steel plate 1a. The first resin layer 1b contains a resin and has a higher rust prevention property than the steel plate 1a. As a result, the first resin layer 1b enhances the rust prevention property of the steel plate 1a. Such a resin is, for example, an organic resin such as a water-based coating composition or an organic solvent-based coating composition. In order to further improve the adhesion and corrosion resistance of the first resin layer 1b to the steel plate 1a, a base treatment film may be provided between the first resin layer 1b and the surface of the steel plate 1a. When a base treatment film is provided in this way, the number and composition of the layers of the base treatment film are not limited. The first resin layer 1b may further contain a pigment. Such a pigment is, for example, an anti-rust pigment or a conductive pigment. The type of the anti-rust pigment and the type of the conductive pigment are not particularly limited, but it is preferable that the anti-rust pigment contains one or more selected from, for example, a silicate compound, a phosphate compound, a vanadate compound, and metal oxide fine particles. In addition, the conductive pigment preferably contains at least one selected from, for example, metals, alloys, conductive carbon, iron phosphide, carbides, and semiconductor oxides.

The resin-coated steel sheet 1 may have at least one of an electrocoating layer, an intermediate coating layer, and a topcoat coating layer. At least one of the electrocoating layer, the intermediate coating layer, and the topcoat coating layer covers at least a portion of the first resin layer 1b.

The reinforcing member 2 is provided on the vehicle inner surface of the steel plate 1a. The reinforcing member 2 may be any member that reinforces the steel plate 1a. The reinforcing member 2 shown in FIG. 1 has a shape that extends approximately like a cross, but the reinforcing member 2 may have a wide variety of other shapes. The reinforcing member 2 is not covered with a resin layer. As shown in FIG. 2, the reinforcing member 2 may have a wedge-shaped cross section.

The reinforcing member 2 and the steel plate 1a may be joined by thermal welding. Such thermal welding may be, for example, spot welding.

As described above, according to the configuration of the vehicle exterior panel 10, the first resin layer 1b covers the vehicle inner surface of the steel plate 1a, so that the reinforcing member 2 and the steel plate 1a come into contact with each other via the first resin layer 1b. The presence of the first resin layer 1b on the steel plate 1a enhances the rust resistance of the mating surface between the reinforcing member 2 and the steel plate 1a.

In addition, according to the configuration of the vehicle exterior panel 10 of this embodiment, the outer surface of the steel plate 1a is not covered with a resin layer. This makes it possible to reduce the amount of resin layer used. In other words, it is possible to ensure rust prevention between the reinforcing member and the steel plate while reducing the amount of resin layer used, thereby reducing costs.

Next, an example of a method for manufacturing the vehicle exterior panel 10 will be described. First, a coating film is applied to the vehicle inner surface of the steel plate 1a to form a first resin layer 1b on the steel plate 1a. Next, the steel plate 1a with the first resin layer 1b formed thereon is processed or shaped into the shape of the part to which the vehicle exterior panel 10 is applied. A reinforcing member 2 is placed on the vehicle inner surface of the processed or shaped steel plate 1a. In this manner, the vehicle exterior panel 10 can be manufactured. If necessary, at least one of electrocoating, undercoating, and topcoating may be applied to the steel plate 1a on which the reinforcing member 2 is placed.

(One modified example)
Next, a modified example of the vehicle exterior panel 10 will be described with reference to Fig. 3. Fig. 3 is a schematic cross-sectional view of a main part of the modified example of the vehicle exterior panel shown in Fig. 1.

The vehicle exterior panel 10a shown in FIG. 3 is a modified version of the vehicle exterior panel 10 shown in FIG. 1 and FIG. 2. The vehicle exterior panel 10a has the same configuration as the vehicle exterior panel 10, except that it is provided with a mastic adhesive 3 and a second resin layer 1c.

As shown in FIG. 3, the vehicle exterior panel 10a includes a mastic adhesive 3 and a second resin layer 1c.

The mastic adhesive 3 is provided between the steel plate 1a and the reinforcing member 2. The mastic adhesive 3 may be used to join the steel plate 1a and the reinforcing member 2. The joining method using the mastic adhesive 3 has less impact on the design of the vehicle exterior panel 10 compared to the joining method using heat welding. When the steel plate 1a and the reinforcing member 2 are joined using the joining method using heat welding, the dents from the spot welding and the distortion of the surface may affect the design surface. On the other hand, when the steel plate 1a and the reinforcing member 2 are joined using the joining method using the mastic adhesive 3, there is no need to perform spot welding, so there is almost no impact on the design surface from the dents from the spot welding and the distortion of the surface. Unlike the joining method using heat welding, the joining method using the mastic adhesive 3 can avoid an impact on the design of the vehicle exterior panel 10.

As shown in FIG. 3, when the reinforcing member 2 has a wedge-shaped cross section, the reinforcing member 2 and the steel plate 1a firmly sandwich and hold the mastic adhesive 3. This stabilizes the position of the mastic adhesive 3. The steel plate 1a may also have a portion that protrudes outward from the vehicle.

The second resin layer 1c covers the outer surface of the steel plate 1a. The first resin layer 1b is thicker than the second resin layer 1c. In other words, the thickness t _1b of the first resin layer 1b is larger than the thickness t _1c of the second resin layer 1c. Therefore, the inner surface of the steel plate 1a is protected by the first resin layer 1b, which is thicker than the second resin layer 1c on the outer surface of the steel plate 1a. This can improve the rust prevention of the inner surface of the steel plate 1a. The second resin layer 1c may have a similar configuration to the first resin layer 1b.

According to the above-mentioned configuration of the vehicle outer panel 10a, the first resin layer 1b covers the vehicle inner surface of the steel plate 1a, and the second resin layer 1c covers the outer surface of the steel plate 1a. Therefore, rust prevention can be ensured for the outer surface of the steel plate 1a in addition to between the reinforcing member 2 and the steel plate 1a. Furthermore, since the second resin layer 1c is thinner than the first resin layer 1b, the amount of resin layer used can be reduced. This allows costs to be reduced.

In addition, according to the configuration of the vehicle exterior panel 10a, when the reinforcing member 2 has a wedge-shaped cross section, the reinforcing member 2 and the steel plate 1a firmly sandwich and hold the mastic adhesive 3. This stabilizes the position of the mastic adhesive 3. On the other hand, in such a case, the reinforcing member 2 may retain water depending on the usage environment of the vehicle (not shown) in which the vehicle exterior panel 10a is mounted. Even if the reinforcing member 2 retains water in this way, as described above, the first resin layer 1b covers the vehicle inner surface of the steel plate 1a, so that the vehicle inner surface of the steel plate 1a can be protected from the water retained by the reinforcing member 2. This improves the rust resistance of the steel plate 1a.

The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the invention. The present invention may also be implemented by combining the above-described embodiment or examples thereof as appropriate.

10, 10a Vehicle exterior panel 1 Resin-coated steel plate 1a Steel plate 1b First resin layer 1c Second resin layer 2 Reinforcing member 3 Mastic adhesive t _1b Thickness of first resin layer 1b t _1c Thickness of second resin layer 1c

Claims (4)

A vehicle exterior panel for covering the interior of a vehicle,
A steel plate having a shape of a vehicle outer panel;
A reinforcing member provided on an inner surface of the steel plate to reinforce the steel plate;
A first resin layer that covers the vehicle inner surface of the steel plate,
The reinforcing member is not covered with a resin layer,
A mastic adhesive is provided between the steel plate and the reinforcing member.
Exterior panels for vehicles. The outer surface of the steel plate is not covered with a resin layer;
2. The vehicle exterior panel according to claim 1 . A vehicle exterior panel for covering the interior of a vehicle,
A steel plate having a shape of a vehicle outer panel;
A reinforcing member provided on an inner surface of the steel plate to reinforce the steel plate;
A first resin layer covering the vehicle inner surface of the steel plate;
A second resin layer covering the outer surface of the steel plate;
Equipped with
The reinforcing member is not covered with a resin layer,
The first resin layer is thicker than the second resin layer.
Exterior panels for vehicles . A vehicle hood to which the vehicle outer panel according to any one of claims 1 to 3 is applied.

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